ENGLISH VERSION
🚨 Audi/VW Mild Hybrid – A System Designed to Fail 🚨
The so-called “hybrid” trend has now mutated into the “Mild Hybrid” – a system where customers pay more and receive even less in return.
This setup combines the alternator and starter into a single 48V electric motor controlled via a VFD three-phase inverter mounted directly on the engine. The entire unit relies on HEXFET transistors and is “cooled” by antifreeze, though in practice, it’s often heated to 95°C – fast-tracking the component’s failure.
Unlike classic hybrid systems, the electric motor in a Mild Hybrid cannot independently drive the car. It merely assists the internal combustion engine to simulate “efficiency” – savings that usually go straight into the pockets of authorized service networks… or independent workshops like ours.
We’ve received several inquiries on this issue, but so far, no one has come for in-depth diagnostics. Interestingly, a technician from an authorized service center in Munich offered us 100 defective units for €100 each – casually pulled from the trash. The narrative? “These never break. Just fuel up and drive.” Yet 100 units in the dumpster say otherwise.
If the electric motor (a.k.a. MHD starter) fails, the engine won’t even start. According to insider sources, this failure can occur as early as 50,000 km. And when the HEXFET burns out, there’s no easy way to detach the support frame from the aluminum heat sink to replace the damaged part. Even if a high-quality repair method existed, the OEM design is flawed – these components weren’t meant to be reliable, not even when brand new.
This is arguably the lowest-quality interpretation of a hybrid system yet. The most alarming aspect is how often we hear mechanics complain: after a routine service, the customer returns claiming “everything worked before – now it doesn’t.” A typical tactic used to pressure workshops into covering the cost of poor factory design.
🔧 Our recommendation to fellow technicians: Avoid servicing these vehicles if possible. You’re likely to end up paying for someone else’s engineering shortcuts.
HRVATSKA VERZIJA
🚨 Audi/VW Mild Hybrid – Sustav dizajniran da otkaže 🚨
Zaraza zvana “Hybrid” mutirala je u “Mild Hybrid” – sustav gdje za još više novca kupac dobiva još manje.
Ovdje se alternator i anlaser spajaju u jedan 48V elektromotor koji se kontrolira preko VFD trofaznog invertera montiranog izravno na motor. Cijeli sklop koristi HEXFET tranzistore i “hladi se” antifrizom – u praksi, zapravo se grije na 95°C, ubrzavajući kvar.
Za razliku od klasičnih hibrida, ovaj elektromotor ne može samostalno pokretati vozilo. Samo “pomaže” fosilnoj prdilici kako bi se stvorila iluzija uštede – koja najčešće završi kod ovlaštenih servisa… ili kod nas.
Imali smo nekoliko poziva vezano uz ovaj kvar, ali nitko nije došao na ozbiljnu analizu. Zanimljivo, jedan tehničar iz ovlaštenog servisa u Minhenu nudio je 100 komada neispravnih uređaja po 100 € komad – “slučajno” izvučenih iz smeća. Kažu: “Nikad ništa ne rikne, samo toči i vozi.” A 100 komada u kontejneru govori suprotno.
Ako otkaže elektromotor (poznat kao MHD anlaser), tada ni motor s unutarnjim izgaranjem ne može upaliti. Prema informacijama “insajdera”, ovaj kvar nastupa već oko 50.000 km. A kada izgori HEXFET, nema jednostavnog načina za odvajanje nosača od aluminijskog hladnjaka da bi se zamijenio dio. I da postoji metoda jednaka tvorničkoj kvaliteti – uzalud. Komponenta je loše dizajnirana i nije predviđena da ispravno radi ni kad je nova.
Ovo je vjerojatno najlošija varijanta hibridnog sustava do sada. Najgore od svega? Sve češće slušamo prigovore mehaničara koji odrade redovni servis, a korisnik se vraća s pritužbom: “Sve je radilo prije servisa, sad više ne radi.” Klasična ucjena kojom se odgovornost pokušava prebaciti na servisere.
🔧 Naša preporuka kolegama: Izbjegavajte raditi na ovim vozilima. Previše rizika, nula garancije. Na kraju – vi plaćate za nečiji loš inženjering.
Price:
New – 2000€
EVC – 
Error:
U046900 a starter/generator control unit signal is unreliable;
C11CBF0-12V on-board power grid
P0A7D00-hybrid battery charge level is low
P0B2900-hybrid/high-voltage battery deep discharge
P1B1600-hybrid battery no external charging
Partnumber:
4n0903028m
4n0903028n
4n0903028h
4n0903028j
Vozila:
A6, S6, A7, S7, A8, S8
2018 – 2022
Processor: SPC564A70L7
